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11. 发明专利

JPH05347720A 失效
公开(公告)号：JPH05347720A
公开(公告)日：1993-12-27
申请号：JP15462892
申请日：1992-06-15
申请人： MATSUSHITA ELECTRIC IND CO LTD
发明人： SAKAI SATORU
IPC分类号： H04N5/14
摘要： PURPOSE:To improve the deterioration of transmission characteristic that is caused at the lower level side of a video signal and to improve the frequency characteristic when the images are amplified with a large amplitudes with a video amplifier consisting of a cascade amplifier and an emitter-grounded amplifier of a CRT display device of high accuracy. CONSTITUTION:The gain is increased by a negative feedback amplifier for an emitter-grounded amplifier of a transistor TR 5. At the same time, the voltage of a power voltage supply terminal 31 of the emitter-grounded amplifier is set at a high level compared with a bas bias supply terminal 30 of a TR 8. Thus, the operation of the amplifier is eliminated in a nonlinear area at the rise of the transistor characteristic and the amplifier is driven in a linear area only. In such a way, the transmission characteristic can be improved for the video signals.

12. 发明专利

JPH0352683B2 失效
公开(公告)号：JPH0352683B2
公开(公告)日：1991-08-12
申请号：JP12563584
申请日：1984-06-18
申请人： MATSUSHITA ELECTRIC IND CO LTD
发明人： YOSHIDA TOSHIFUMI , SAKAI SATORU , UEDA MINORU
IPC分类号： H03F1/26 , H03F1/34 , H03F1/42

13. 发明专利

JPH01171308A VIDEO AMPLIFYING CIRCUIT 失效
公开(公告)号：JPH01171308A
公开(公告)日：1989-07-06
申请号：JP33077987
申请日：1987-12-25
申请人： MATSUSHITA ELECTRIC IND CO LTD
发明人： SAKAI SATORU
IPC分类号： H03F3/45
摘要： PURPOSE:To obtain a flat frequency characteristic over a wide band with low power consumption by connecting between the emitter of a collector grounding pre-stage amplifier and the emitter of a base grounding post stage amplifier each provided with a constant current source, with a coaxial cable line being matched in impedance, and constituting a differential amplifier. CONSTITUTION:A base bias is set so as to supply an equal current to a constant current transistor(TR) comprising TRs Q2, Q4 and the emitter of the TR Q1 and the emitter of the TR Q3 are connected directly by resistors 5, 7 and a coaxial cable 6, then the TRs Q1, Q3 act like a differential amplifier using the TRs Q2, Q4 as a constant current source, and its amplification factor depends nearly on the resistors 5, 7 and 8. In case of using a 75ohm coaxial cable 6, a resistance of 75ohms is used for the resistors 5, 7 to take matching with the coaxial cable. Since the DC power supply is set by the constant current source circuit independently of the impedance of the coaxial cable line, and the coaxial cable line is driven between the emitters of the differential amplifier, the output signal of the pre-stage is completely sent to the amplifier of the post-stage.

14. 发明专利

JPS63299401A CASCADE-CONNECTED AMPLIFIER 失效
公开(公告)号：JPS63299401A
公开(公告)日：1988-12-06
申请号：JP13357187
申请日：1987-05-28
申请人： MATSUSHITA ELECTRIC IND CO LTD
发明人： SAKAI SATORU
IPC分类号： H03F1/22 , H03F1/30
摘要： PURPOSE:To sufficiently perform the temperature compensation of a first cascade connection circuit, by offsetting the change of an output current due to the temperature change of a collector cut-off current and the DC current amplification factor of the first cascade connection circuit with the temperature change of the collector cut-off current and the DC current amplification factor of a second cascade connection circuit. CONSTITUTION:The change component of a collector current due to the collector cut-off current ICBO1 of a first transistor 2 is offset by the change of the collector cut-off current ICBO3 of a third transistor 11. Similarly, the change component of the collector current of a second transistor 5 is offset by the change of the collector cut-off current ICBO4 of a fourth transistor 12, thereby, the change of the output current due to the currents ICBO1 and ICBO2 can be eliminated. Also, the change component of an emitter current due to the change of the DC current amplification factor h of the transistors 2 and 5 can be absorbed by the change component of the base currents of transistors 11 and 12. Therefore, the temperature compensation can be performed by eliminating the change of the output current due to the temperature change of the first cascade connection circuit 10 by the second cascade connection circuit 14.

15. 发明专利

JPS6377316A OUTPUT PROTECTOR 失效
公开(公告)号：JPS6377316A
公开(公告)日：1988-04-07
申请号：JP22306486
申请日：1986-09-19
申请人： MATSUSHITA ELECTRIC IND CO LTD
发明人： SAKAI SATORU , SHIOTANI YUICHI
IPC分类号： H02H9/02

16. 发明专利

JPS6150440B2 失效
公开(公告)号：JPS6150440B2
公开(公告)日：1986-11-04
申请号：JP12555577
申请日：1977-10-18
申请人： MATSUSHITA ELECTRIC IND CO LTD
发明人： ISODA MIKIO , SASABE KAORU , SAKAI SATORU , USUI AKIRA
IPC分类号： H04S1/00 , H04S5/00

17. 发明专利

JPH11136536A HORIZONTAL DEFLECTING CIRCUIT 失效
公开(公告)号：JPH11136536A
公开(公告)日：1999-05-21
申请号：JP30015397
申请日：1997-10-31
申请人： MATSUSHITA ELECTRIC IND CO LTD
发明人： KAWASHIMA MASAHIRO , SAKAI SATORU
IPC分类号： H04N3/23 , G09G1/00 , G09G1/04
摘要： PROBLEM TO BE SOLVED: To prevent linearlity performance on a screen from deteriorating with temperature variation by correcting the linearlity of a horizontal deflecting circuit by combining different current-to-inductance characteristics of different kind of linearlity coils. SOLUTION: The horizontal deflecting circuit is equipped with the linearlity coils 11 and 12, which have at least two kind of current-to-inductance characteristics and temperature characteristics. The different current-to- inductance characteristics of those linearity coils 11 and 12 are combined to correct the linearlity of the horizontal deflecting circuit. Consequently, deterioration in the linearlity performance on the screen with temperature in case of an increase in the self-heating of the linearlity coils 11 and 12 when the horizontal scanning frequency is high, a great increase in the self-heating of the linearlity coils 11 and 12 due to a difference in horizontal scanning frequency by signals, and variation in the ambient temperature of a display device can be prevented.

18. 发明专利

JPH07274092A BEAM CURRENT CONTROL CIRCUIT 失效
公开(公告)号：JPH07274092A
公开(公告)日：1995-10-20
申请号：JP5792194
申请日：1994-03-29
申请人： MATSUSHITA ELECTRIC IND CO LTD
发明人： SEKIZAWA TAKU , SAKAI SATORU
IPC分类号： H04N5/59
摘要： PURPOSE:To realize a beam current control circuit where beam current per unit area in a CRT fluorescent screen becomes fixed so that luminance is not changed when a fixed level of video input signal is inputted. CONSTITUTION:The contrast value of a contrast adjusting circuit 11 is controlled by following a control voltage VsS14 which is proportionated to a raster area on a CRT surface so as to permit beam current per unit area in the fluorescent screen to be fixed as against the fixed level of video input signal S11 even if a raster size on the CRT surface is changed. By the above configuration, the beam current control circuit where fixed luminance is obtained even if the raster size is changed as against the fixed level of video input signal S11 is realized.

19. 发明专利

JPH0250646B2 失效
公开(公告)号：JPH0250646B2
公开(公告)日：1990-11-05
申请号：JP26383884
申请日：1984-12-14
申请人： MATSUSHITA ELECTRIC IND CO LTD
发明人： SAKAI SATORU , YOSHIDA TOSHIFUMI , NISHINAKA YASURO
IPC分类号： H03F3/34 , G11B19/20 , H03F3/04 , H03F3/68

20. 发明专利

JPS6460163A PICTURE DISPLAY DEVICE 失效
公开(公告)号：JPS6460163A
公开(公告)日：1989-03-07
申请号：JP21686887
申请日：1987-08-31
申请人： MATSUSHITA ELECTRIC IND CO LTD
发明人： NISHIDE TAKUYA , SAKAI SATORU
IPC分类号： H01J31/12 , H04N5/68
摘要： PURPOSE:To cause an electron beam to necessarily beat a specified fluorescent material and to execute a true color reproduction by arranging one part of a linear cathode or a heating element to generate the electron beam in the periphery of the screen of an picture display device or on the screen. CONSTITUTION:A heater 22 is an example in which one part of a linear cathode 2d is arranged around the periphery of a screen 9. Consequently, when the power source of the picture display device is turned on, beam deflection control electrodes 3-7 are heated by the linear cathode 2, and simultaneously, the screen 9 can be heated by 22 which is one part of the linear cathode 2. As a result, the beam deflection control electrodes 3-7 and the screen 9 can be stretched and contracted at the same coefficient of expansion as a time passes. Thus, the electron beam can beat the specified fluorescent material regardless of a heat, and the true color reproduction can be executed.

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